Larry Tabb’s Take on the SEC Investigations into High-Frequency Trading Practices

By Larry Tabb, for Wall Street & Technology

Larry Tabb, founder and CEO of TABB Group (

“On Friday, April 29, the Justice Department and the SEC opened a joint investigation into high-frequency trading practices. Bloomberg reported that the investigation will focus on whether high-speed traders are placing and cancelling waves of orders in attempt to manipulate the market.

What can I say? What took so long?

The investigation is a win-win. Either the Justice Department and the SEC find abuse, lock up the scofflaws and throw away the keys, or they don’t fine manipulation and give current trading practices a green light. Either way, the market wins.

The market has been struggling to come to grips with high-frequency trading for more than three years now. It has become a he-said, she-said cat fight without any proof on either side or a clear winner. High-frequency trading proponents promote their wonderful liquidity, and the antagonists scorn the creation of a horrible, two-tiered market in which the average investor gets hosed.

Can someone please tell me, am I being pampered, or screwed? While I have tremendous sympathy for the high-frequency trading firms that probably are dealing with the impatient Justice Department’s data requests right now and likely are having their computers confiscated as we speak, one way or another, I would love for this fight to be over.

While it would be great if this all had been over yesterday, the reality of the matter is, the investigation will take years. The amount of data created from an high-frequency/algorithmic trading engine is tremendous. These machines read gigabytes of daily data to determine when to trade and then execute their orders against 50 or so markets simultaneously. Just deciphering one strategy must be difficult enough, but given dozens or hundreds of strategies that must be untangled, analyzed and demystified within our microsecond trading environment, it will drive a bunch of lawyers simply nuts.

A Frightful Task

Think about explaining to a lawyer a complex trading strategy spanning multiple venues. Think about trying to discern the nuances of what a trading engine saw — what signals it received, how it reacted, why it either tried to place or take liquidity, and how it managed risk across multiple asset classes in microseconds at a rate of thousands of orders per second? Frightful. And firms will need to do this in front of a guy who is more than ready to fine you or throw you in jail if investigators don’t like your answers. I’m certainly glad it isn’t me.

While analyzing this data will be difficult, it must be possible. If the modelers can tease out the order creation and execution logic, then there must be a way for these same developers, modelers and technologists to vet if the models are trading off of the right signals, or if they are functioning properly or not.

If the process is fair, done under the proper light, and doesn’t turn out to be a Spanish Inquisition — and the high-frequency trading firms can survive — it just may be the kind of insight we need. The best thing may just be to open these models to the light, vet these trading strategies in front of experts and battle it out in a court of law.

If we as an industry cannot pass through the scrutiny of inquiry, the robustness of a trial and the (hopefully) blind scales of justice, then unfortunately we deserve the mistrust, venom and poor press we receive.”

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